18 January 2007 - Draft minutes of the SEAC 95 meeting (426 KB) held on 7December 2006 are now available.

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64. A member noted that at the recent Neuroprion meeting, a study waspresented showing that in transgenic mice BSE passaged in sheep may be morevirulent and infectious to a wider range of species than bovine derived BSE.

Other work presented suggested that BSE and bovine amyloidotic spongiformencephalopathy (BASE) MAY BE RELATED. A mutation had been identified in theprion protein gene in an AMERICAN BASE CASE THAT WAS SIMILAR IN NATURE TO AMUTATION FOUND IN CASES OF SPORADIC CJD.

Bovine Amyloid Spongiform Encephalopathy (BASE) is an atypical BSE straindiscovered recently in Italy, and similar or different atypical BSE caseswere also reported in other countries. The infectivity and phenotypes ofthese atypical BSE strains in humans are unknown. In collaboration withPierluigi Gambetti, as well as Maria Caramelli and her co-workers, we haveinoculated transgenic mice expressing human prion protein with brainhomogenates from BASE or BSE infected cattle. Our data shows that about halfof the BASE-inoculated mice became infected with an average incubation timeof about 19 months; in contrast, none of the BSE-inoculated mice appear tobe infected after more than 2 years.

***These results indicate that BASE is transmissible to humans and suggest that BASE is more virulent thanclassical BSE in humans.***